Competition between predissociative and radiative decays in the e(3)Sigma(+)(u) and d(3)Pi(-)(u) states of H-2 and D-2

Kiyoshima, T.; Sato, S.; Adamson, S.O.; Pazyuk, E.A.; Stolyarov, A.V.

Авторы: Kiyoshima T., Sato S., Adamson S.O., Pazyuk E.A., Stolyarov A.V.
Журнал: Physical Review A - Atomic, Molecular, and Optical Physics
Том: 60
Номер: 6
Год издания: 1999
Издательство: American Physical Society
Местоположение издательства: United States
Первая страница: 4494
Последняя страница: 4503
DOI: 10.1103/PhysRevA.60.4494
Аннотация: Experimental and theoretical lifetimes tau(v’N’) for e(3)Sigma(n)(+) and d(3)Pi(u)(-) states of molecular hydrogen and deuterium are presented in a wide range of vibrational v’ and rotational N’ quantum numbers. Lifetimes have been measured by a delayed coincidence method following electron-impact excitation from the ground state. The cascade effects on the lifetimes measured were estimated to be negligible through a detailed analysis. Predissociative rates were estimated by the Fermi golden rule based on adiabatic rovibronic wave functions and radial coupling matrix elements B(R) for the e(3)Sigma(u)(+) similar to b(3)Sigma(u)(+) and d(3)Pi(u)(-) similar to c(3)Pi(u)(-) pairs of interacting states. The radiative lifetimes of both excited states were evaluated by the theoretical e(3)Sigma(u)(+) - a(3)Sigma(g)(+) and d(3)Pi(u) - a(3)Sigma(g)(+) transition dipole moment functions d(R) and adiabatic rovibronic wave functions of the states involved The electronic matrix elements B(R) and d(R) were obtained by direct ab initio calculations as well as within the framework of quantum defect theory. The ab initio B(R) functions were calculated by the finite-difference method and by the analytical Sidis formula, which were based on the full configuration-interaction electronic wave functions. At small and medium internuclear distances the quantum defect matrix elements agree well with their ab initio counterparts. The predissociative rates for both e(3)Sigma(u)(+)(v’ greater than or equal to 0) d(3)Pi(u)(-)(v’ greater than or equal to 4) states of hydrogen were found to increase sharply as the v’ value of the predissociated level increases, and become compatible with the radiative decay rate. The predissociation effect in the deuterium was negligible for both states studied; hence their experimental lifetimes correspond to the radiative decay channel only. A sum of the theoretical radiative and predissociative rates was in good agreement with the experimental results for the e(3)Sigma(u)(+) state but slightly overestimated for the d(3)Pi(u)(-), state. Reasons for the remaining discrepancies are discussed and suggestions for further improvements are given. [S1050-2947(99)10212-9].
Добавил в систему: Столяров Андрей Владиславович

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Competition between predissociative and radiative decays in the e(3)Sigma(+)(u) and d(3)Pi(-)(u) states of H-2 and D-2статья

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